Changelog:
===============
- Added decorator functionality to Signal as a convenient way to add a callback
- Improved type safety by allowing callback parameters to be type checked
(typing-extensions is now required for Python <3.13). Parameters for a Signal
callback should now be defined like Signal[int, str]
- Removed the sphinxcontrib-asyncio documentation dependency.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
